In the given figure AB || CD, ∠APQ = 50° and ∠PRD = 120°. Find ∠QPR.
According to question,
PRD = 120O
PRD = APR (Pair of alternate interior angles)
So,
APR = 120
APQ + QPR = 120
50 + QPR = 120
QPR = 120 – 50
= 70O